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+A method was called on an ambiguous numeric type.
+
+Erroneous code example:
+
+```compile_fail,E0689
+2.0.neg(); // error!
+```
+
+This error indicates that the numeric value for the method being passed exists
+but the type of the numeric value or binding could not be identified.
+
+The error happens on numeric literals and on numeric bindings without an
+identified concrete type:
+
+```compile_fail,E0689
+let x = 2.0;
+x.neg();  // same error as above
+```
+
+Because of this, you must give the numeric literal or binding a type:
+
+```
+use std::ops::Neg;
+
+let _ = 2.0_f32.neg(); // ok!
+let x: f32 = 2.0;
+let _ = x.neg(); // ok!
+let _ = (2.0 as f32).neg(); // ok!
+```